Siemens SIRIUS 3RT2 Power contactor, S2, 3-pole, 1NO+1NC, 24VDC coil, 22kW, 50A Part number 3RT2036-3KB40

Product Overview

The Siemens 3RT2036-3KB40 is a SIRIUS 3RT2 series three-pole power contactor designed for industrial motor and heavy-load switching applications. It features a 24 V DC coil, is rated for AC-3 duty at 51 A (400 V) and 22 kW, and comes with integrated varistor suppression and auxiliary contacts (1 NO + 1 NC). The compact size designation S2 allows for space-efficient installations with high switching performance.

Key Features

• 3-pole power contactor from the Siemens SIRIUS 3RT2 family
• Rated operational current: 51 A at 400 V AC (AC-3) and motor power up to 22 kW
• 24 V DC control coil with integrated varistor for surge protection
• Auxiliary contacts: 1 NO + 1 NC for control circuit feedback
• Compact size S2 enables space saving in control panels
• Screw-type main connections and spring-loaded terminals for control/auxiliary circuits, suitable for PLC outputs
• Wide ambient operating range (-25 °C to +60 °C) and high mechanical endurance (10 million cycles)

Technical Specifications

• Article Number: 3RT2036-3KB40
• Product Series: Siemens SIRIUS 3RT2
• Number of Poles: 3
• Rated Control Voltage (Coil): 24 V DC
• Rated Operational Current (AC-3, 400 V): 51 A
• Rated Motor Power (AC-3, 400 V): 22 kW
• Insulation Voltage (Ui): 690 V
• Surge Voltage Resistance: 6 kV
• Mechanical Service Life: Approx. 10 000 000 switching operations
• Ambient Operating Temperature: –25 °C … +60 °C

Compliance & Certifications

• Designed and manufactured by Siemens in accordance with IEC/EN standards for industrial contactors
• Approved for global use with high reliability in heavy-duty switching and automation systems

Applications

Ideal for industrial automation systems, motor control centres, machine-tool installations and switchgear panels requiring robust and compact contactor solutions. Suitable for controlling three-phase motors, pumps, compressors and heavy loads where forward switching and high reliability are critical.